elliot



W H. ELLIOT.

. Coffee Pot.

No. 22,716. Patented Jan. 25, 1859.

my improved coffee-pot.

UNITED STAT 5;. PAT

W. H. ELLIOT, OF PLATTSBURG, NEW YORK.

COFFEE-POT.

Speccation forming part of Letters Patent No. 22,716, dated January 25,1859-; Ressued lVIay 10, 1859, No. '713.

T o all whom 'it may concern:

Be it known that I, W. II. ELLIOT, of Plattsburg, in the county ofClinton and State of New York, have invented a new and usefulImprovement in Coffee-Pots; and I do hereby declare that the followingis a full and exact description thereof, reference being had to theaccompanying drawings and the letters of reference marked thereon,similar letters of reference indicating the same part in each figure.

The nature of my invention consists in so constructing a condensingcoffee-pot that the vapor may be prevented from escaping therefrom bymeans of a water oint, and in so arranging said water joint within theboiler and in connection with the condenser, that the condensed vaporshall first fall into the water joint and afterward into the boiler withthe boiling coffee, and also, so that the water, in the water joint, maybe poured out of the boiler with the coffee. And it further consists inplacing a non conductor of heat between the water joint and the body ofth-e condenser.

To enable others to make and use my invention, I will proceed todescribe its construction and operation.

Figure l is a perpendicular section of Fig. 2 is a plan of thecondenser, showing within it, the still worin. Fig. 3 is a perpendicularsection of a condenser, showing a diiferent arrangement of the nonconductor.

a, boiler portion of the coffee-pot, condenser, c, water-joint, cl,spout, e, jacket of the condenser, f, tube, through which the vaporenters the still worm, g, tube which conducts the condensed vapor fromthe still worm into the water-joint, l1., steam space within the stillworm, z, height of the water in the water-joint, m, m, still worm, n,non

conducting material, 0, line of section of Fig. l.

This coif'eepot is used exact-ly in the same manner that the common oneis used, without a condenser, with the exception that, when the coffeeis ready for boiling, instead of closing the top of the coee-pot withthe cover, the condenser must be placed upon the boiler, and filled withcold water. It should then be set over the fire and boiled steadily forthirty minutes. If the fire be too hot, like any other coieepot, it willboil over, but this may be prevented in most cases by filling the boileronly about two thirds full before boiling. After the coffee has beenboiled, as much boiling water as is required may be poured in withoutreference to the water-joint. It is well to pour a little water into thewaterjoint, before placing the condenser upon the boiler, though thecondensed vapor would soon fill the joint, if this wer-e neglected.After the coffee has been boiled suiiciently, the condenser may beremoved from the boiler, and the cover placed upon it. It is now readyfor use.

The vapor which is created by the boiling coffee passes up tube f,thence into the still worm m, and before it reaches the discharge tubeC, the vapor is condensed to a liquid, and is discharged by tube g, intothe water joint c, below the surface of the water, so that if any vaporwere to be discharged from tube g, it would be condensed by the water inthe water-joint.

Many advantages are gained by employing a water-joint for connecting acoffee boiler with its condenser. In the first place very littlemechanical skill is necessary to construct a water-joint and when doneeven in the roughest manner, its operation is positively pei'fect as ajoint, until a certain amount of pressure is produced, when it is saferthat the vapor should escape than be confined. IVhile on the other hand,it is a diiicult matter to construct out of the inaterial commonly usedfor coffee-pots, a steametight joint between the boiler and condenser,by fitting one into the other, and, though a joint might be so made atfirst a slight bruise would cause a leak, so as to render the condenseruseless.

A coffee boiler must always be subject to sudden changes in the amountof heat applied to it, in consequence of the necessity of moving it fromplace to place, but from this cause, no fear need be entertained, as thewater-joint is always ready to act as a safety valve against eitherexplosion or collapse, which might result from suddenly creating orcondensing vapor, and a boiler for this purpose must be so constructed,that the top of the boiler, or feed opening, may readily be opened andclosed again in the most perfect manner by persons possessing` noniechanical skill, so that the several purposes of filling the boiler,watching the process of boiling, cleaning the boiler, &c., may beaccomplished without that difficulty and danger which always attends theopening of a steam tight joint large enough to surround the feed openingof a coffee boiler, when constructed in the ordinary way, as experiencehas proven. By the arrangement of a water-joint around the feed openingof a coffee boiler, these indispensable objects are attained, as it isonly necessary to lift the cover or condenser off to open the boiler,and set it on again to cover the feed opening steam tight.

By enlarging the water-joint and covering the feed opening by a cover insuch a inanner as to pass all the vapor through the water-joint, thecondenser might be dispensed with, as the water-joint, when so employed,would condense all the vapor, if it were large enough.

The water-joint c, serves three important purposes: First, that ofclosing, in the most perfect manner, all the outlets for vapor from theboiler; second, it is thoroughly reliable as a safety valve; third, itacts as a condenser on any vapor that may escape from the still worm.

By arranging the water-joint below the spout, two important purposes areserved. First, no vapor can pass out at the spout without first passingthrough the waterjoint; second, the water from the joint may be pouredout through the spout with the coffee. Another important purpose isserved by placing the water joint within the boiler. It has been foundin use, that moving the boiler, while the coffee is boiling, from thelire to a table, or even, to change its position on the fire, creates asudden condensation of vapor within the boiler, and a consequent suctionupon the Water in the joint, which causes the water to How from thejoint into the boiler until the lower end of tube g, is exposed, whenthe air rushes in through the still worm, to fill the vacuum. rlheconstant discharge of liquid from the condenser, not only keeps thewater-joint full, but causes it to overliow into the boiler, but, whenfrom either of these causes, the water passes out of the joint, nodisturbance is created, as it falls into the boiling coffee, which itwould not do if the water-joint were not placed within the chamber ofthe boiler.

By the employment of a nonconducting material nl, a, between the hotliquid in the boiler, and the cold water in the condenser, the heat isprevented from passing from the hot to the cold liquid, either byconremains cool much longer, than they would if the non conduct-or werenot introduced between them. In a condenser formed as represented atFig. 1 gypsum would be the most suitable nonconductor, but in case thecondenser be constructed as shown at Fig. 3, a plate of Wood Vwould bepreferable. E In closing the coffee pot at any time, a considerablequantity of atmospheric air must always be shut up in the boiler. Anychange in the amount of heat applied to the boiler by moving to a coolerposition, will cause the steam to be condensed suddenly, andconsequently the atmosphere will force itself into the boiler, at anyopening, to fill the vacuum. Gases not condensable are also evolvedby'heating the coffee grounds. It is therefore necessary that thereshould be provided an opening for air and gases between the interior ofthe boiler and the exn ternal air. So that they may nd ingress andegress, without lpassing through the water joint, as in that case theywould partially, if not entirely force the water out of the joint, andthereby interrupt the operations of the condenser. Opening g effectsthis purpose, and it is so arranged that nothing can pass from theinterior of the boiler out, without first passing over agreater part ofthe condensing surface, so that the condensable gases may be reduced toa liquid before they reach the external air, and then turned into theboiler again by the conductors. For the accomplishment of these ends, astill worm condenser is particularly applicable. In such a condenser,the vapor which contains the aroma, does not mix with the condenserwater, but is sent back into the coffee pot pure, and in a liquid state,after having been separated from the noncondensable gases. .In thiscondenser the .water may be changed as often as is necessary to keep itat the required temperature, without throwing away the aroma, nor isthere any aroma lost by the steaming of the condenser water, while theco'ee is boiling. The tube g, must not open so far below the surface ofthe water in the joint as to obstruct the passage of uncondensed vaporthrough the lstill worm.

I do not claim condensing the vapor of coffee so as to prevent the aromafrom passing olf, independent of the peculiar devices,

n and the method of employing them, as herein set forth, but

That I do claim, and wish to have secured to me by Letters Patent, is-

l. The combination of boiler a, still-worm Vcondenser b, conducting ordischarge tube g, the external opening of the still worm at g, whenthese devices are so arranged in relation to each other, that an openingto the external air shall be provided for the nonduction or radiation,so that the coffee boils much sooner, and the Water in the condensercondensable gases, when the condensable vapors are reduced to a liquidwithout coming in Contact With the condensed Water, bnaton with theCondenser for the purpose and then turned by Conductors into the of llngthe Water-joint or keeping it full, 10 boiler, as and for the ptpposespececg). as and for the purpose speced.

2. The arranoelnent 0 the joint c, eloW the spout, so tht no Vapor canpass though XV' H ELLOT' the spout Without rst passing the joint, as setforth.

S. The employment of conductors in com* Witnesses JNO. H. CARTER, SAMUELB. M. BEGKWITH.

[FIRST PRINTED 1911.]

